You skipped CONFIG_NEUTRON_OVS_BRIDGE_MAPPINGS to be assigned correct value
You can update answer file from http://dbaxps.blogspot.com/2015/10/rd...
as you need regarding adding storage node and updating eth(X) matching your names.

You wrote:- we use eth1 at all compute nodes to establish connection to br-int network node
Packstack been run with correct answer-file establish VXLAN tunnels between Compute and Network Nodes , interface been used for VTEP is defined by
CONFIG_NEUTRON_OVS_TUNNEL_IF